11.10 - Decrease launcher icon size? Increase number of Workspaces?

The questions are in the post title, and I'd appreciate a little help!

Q1: How do you decrease the size of the icons in the Launcher (the vertical bar on the left of the desktop)?
(and, while we're at it, how do you make the Launcher disappear unless the mouse is over it?)

Q2: The default number of Workspace is four, arranged in a 2x2 matrix.
How can I increase this to 12, arranged in two rows of six Workspaces?